Agitator



Patented Dec. 3, 1929 UNITED STATES PATENT OFFICE.

'zosnrn- 1:. noun, or mmox,wrsconsm Len-Aron a lication fled mm; a, 1m. Serial m. 9,092.

of a given equipment by increasing the den-- sity (or, in other words, lessening the fluidity) of the pulp during its treatment preceding delivery to the Fourdriniers. While in the old practice a 2 70 pulp was considered proper and of the maximum density possible, it is now common to deal with 6% solutions, with correspondingly increased production capacity.

However, many diflicult problems are encountered in handlin pulp of this density due to its lack of flui ity and its tendency to mass or cake in the storage or treatment tanks and containers. This tendency is inherent in the nature of the material under. treatment due to its fibrous character and to the physical law of attraction of, solids. The liquid Within which the solids are carried serves merely as a supporting medium therefor and facilitates rather than hinders the massing and intertwining of the fibers.

To avoid massing and stratifying of the pulp in the liquid and to maintain a uniform density throughout the entire body of material it must be keptin motion and the motion producing means should have a tendency to break up and tear apart any large or small masses of pulp. In the old practice the mixture was kept in motion by means ofpaddles or impellers in the tank, but this apparatus had very little tendency to break up masses of pulp, and was wholly in'efiective; with stock of increased density. Furthermore, such apparatus'required an outlay of power not commensurate with the results secured.

The tanks, chests or containers which are in place and must be utilized for the new plan of operation are of many and varied forms, all of great size, some narrow and of great length, some deep and some round. The problem has been, therefore, to provide means applicable to these various forms of tanks that would insure effective circulation, the breaking up of pulp masses and the main- 50 tenance at all times of a proper consistency M stood throughout the whole volume of material, with a minimum of power expenditure.

invention will be'more readilyundei: V y reference to the accompanying drawings, of which- .Fig. I is v a transverse sectional view through an agitator constructed in accordance with my invention, the view being taken on the line 1 .-1 of Fig. 3; I

Fig. 2 is'a vertical sectionalview, and

Fig. 3 is a transverse sectional View on the line 3-3 of Fig. 2.

In the drawings I have illustrated a cylindrica'l horizontally disposed tank having cylindrical 'wall 10 and end walls 11, 12. Mounted within the tank and extending vertically thereof is a bafile wall 13 which abuts the end wall 11 and terminates short of the end wall 12 in a continuous vertical deflector 14. The bafile wall is laterally stifl'ened or braced by means of the struts 15 extending horizontally at the horizontal center' line of the tank. J

Apump 16 is mounted in the end wall 11,

being operated by a motor 17. The inlet pipe 18 for-the pump receives material at a low level in the tank from .a compartment at one'side of the said bafile and the discharge pipe 19 projects upwardly from the pump, thence through the baflie wall 13 and discharges .into the chamber on the opposite side of said baflie.

The tank is of relatively great length and adapted to contain a large quantity of paper stock. The pump being in operation, the material is drawn into the inlet and from the pump is discharged through an outlet to an adjacent compartment at a higher level. It thence travels rearwardly around the deflector 14 and backwardly toward the pump.

By this means the material is .suitably agitated and kept in motion at. all times.

I claim:

1. In combination, a cylindrical, horizontally disposed tank having a transverse bafile extending longitudinally within the same and terminating short of one end of the tank,

a deflector at the end of said bafile, and a pump at the opposite end of said tank, said pump having an inlet near the lower level at one .105

side of said baflle and an outlet at a higher level on the other side of said bafile.

2. In combination, a cylindrical horizon tally disposed tank having a transverse vertical longitudinally extending baflle wall connected to the front end wall and terminating short of the rear end wall of the tank, a pump having its inlet at a low point at one sided said bailie wall and its outlet at :2. hi her point at the other side of said baflle wa l.

3. In combination, a cylindrical, horizon tally disposed tank having a transverse vertical longitudinally extending bafile wall connected to the front end wall and termi nating short of the rear end wall of the tank, a pump projecting through the front end Wall of the tank having its inlet ata low point at one side of said baflle wall and its outlet at a higher point at the other side of said baflie wall.

In testimony whereof I have aflixed iny signature.

' JOSEPH E. BOND. 

